62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <sys/types.h>
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#include <lk/err.h>
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#include <kernel/thread.h>
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#include <platform.h>
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#include <platform/interrupts.h>
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#include <platform/timer.h>
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#include <platform/armemu.h>
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#include "platform_p.h"
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static platform_timer_callback t_callback;
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status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval) {
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t_callback = callback;
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*REG(PIT_CLEAR) = 1;
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*REG(PIT_INTERVAL) = interval;
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*REG(PIT_START_PERIODIC) = 1;
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unmask_interrupt(INT_PIT);
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return NO_ERROR;
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}
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lk_bigtime_t current_time_hires(void) {
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lk_bigtime_t time;
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*REG(SYSINFO_TIME_LATCH) = 1;
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time = *REG(SYSINFO_TIME_SECS) * 1000000ULL;
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time += *REG(SYSINFO_TIME_USECS);
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return time;
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}
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lk_time_t current_time(void) {
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lk_time_t time;
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*REG(SYSINFO_TIME_LATCH) = 1;
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time = *REG(SYSINFO_TIME_SECS) * 1000;
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time += *REG(SYSINFO_TIME_USECS) / 1000;
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return time;
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}
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static enum handler_return platform_tick(void *arg) {
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*REG(PIT_CLEAR_INT) = 1;
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if (t_callback) {
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return t_callback(arg, current_time());
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} else {
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return INT_NO_RESCHEDULE;
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}
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}
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void platform_init_timer(void) {
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register_int_handler(INT_PIT, &platform_tick, NULL);
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}
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